Water-cooled furnace door



T. J. PETERS 27,395,757

WATER COOLED FURNACE DOOR Filed May 20, 1943 Pn. E-

Feb. 26, 1946.

Patented Feb. 26, 1946 2,395,757 WATER-CUOLED FURNACE DOOR Tom J.Peters, :regie-Illinois of New Jersey Riverdale, Ill., assigner to Car-Steel Corporation, a corporation Application May 2o, 1943, serial No.487,779

l Claim.

This' invention relates to a water cooled door for use on open hearthfurnaces and high temperature heating furnaces. The inside of thesedoors must be lined with a refractory to withstand the high temperaturesin the furnace. To prevent the door from becoming overheated theremaining portion of the door is water cooled. Heretofore, such doorshad steel studs welded to the door plate or screwed into nuts welded tothe door plate for reinforcing the refractory lining. The heat from therefractory lining was not conducted into the cooling chamber with theresult that thelining would spall and disintegrate, thus requiringfrequent repair of the door.

It is an object of this invention to provide a water cooled door havingmeans for conducting the heat from the refractory into the coolingchamber. This and other objects will be more apparent after referring tothe following specification and attached drawing, in which:

Figure l is an elevation of the door;

Figure 2 is a cross-sectional view taken on line II-JI of Figure 1; andl Figure 3 is an enlarged detail of the stud.

Referring more particularly to the drawing, the reference numeral 2indicates the door plate which is bent to provide a water chamber 4 andan open chamber 6 in that portion of the door facing the furnace. Thechamber 8. is filled with a plastic refractory lining 8. A peep-hole lliextends through the door tov enable the operator to view the conditionswithin the furnace. Fastened to the top of the door plate 2 is aplurality of brackets i2 to which means for supporting the door areattached; Welded to the top of the door are two pipe couplings ornipples I4 which communicate with the water chamber 4. The cooling waterenters through one of these couplings M, circulates through the chamberd and passes out through the other coupling. The construction' of thedoor described above is conventional.V

The invention lies in the provision of studs which extend from thechamber 6 into the water chamber 4, the studs being made of a materialhaving a high coefficient cf thermal conductivity. In practice,commercially pure copper studs have been used with great success. Thestuds i8 are installed as follows:

A plurality of pipe couplings I8 are welded to the door plate over holes20 formed therein. The studs I6 are screwed into the couplings i8 andextend through the holes 2li into the water chamber 4. The tapered pipethreads give a sealing effect, thus preventing leakage of water into therefractory lining. The copper studs reinforce the plastic lining andalso conduct the heat-from the plastic lining into the cooling water.This Yresults in a greatly increased lining life which gives a muchlonger furnace door life while requiring infrequent repairs.

While one embodiment of the invention has been shown and described, itwill be understood that other modifications may be made withoutdeparting from the scope of the attached claim.

I claim:

A`water cooled furnace door comprising a refractory lining in thatportion of the door facing the furnace, a water chamber adjacent saidrefractory lining and a'plurality of closely spaced copper studsembedded in said refractory lining,

said studs extending to within a short distance of the outer face ofsaid refractory lining and substantially through the water chamberwhereby the heat is conducted from said refractory to,

the water in said chamber.

TOM J. PETERS.

